File Share Delivery Failing

I'm trying to deliver a report via the included File Share Delivery method. Every time the subscription fires, the delivery fails with this error in the interface:

Failure writing file Test.pdf : A logon error occurred when attempting to access the file share. The user account or password is not valid.

An in ReportServerService<dateTime>.log, I find the following error:

ReportingServicesService!library!10!08/22/2007-16:17:08:: e ERROR: Throwing Microsoft.ReportingServices.FileShareDeliveryProvider.FileShareProvider+NetworkErrorException: A logon error occurred when attempting to access the file share. The user account or password is not valid., A logon error occurred when attempting to access the file share. The user account or password is not valid.;
Info: Microsoft.ReportingServices.FileShareDeliveryProvider.FileShareProvider+NetworkErrorException: A logon error occurred when attempting to access the file share. The user account or password is not valid. > System.Runtime.InteropServices.COMException (0x8007052E): Logon failure: unknown user name or bad password. (Exception from HRESULT: 0x8007052E)
at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
at RSRemoteRpcClient.RemoteLogon.GetRemoteImpToken(String pRPCEndpointName, Int32 type, Guid dataSourceId, String pUserName, String pDomain, String pPassword)
at Microsoft.ReportingServices.FileShareDeliveryProvider.FileShareProvider.GetImpersonationToken(String userName, String domain, String userPwd)
End of inner exception stack trace
ReportingServicesService!subscription!10!08/22/2007-16:17:08:: Microsoft.ReportingServices.FileShareDeliveryProvider.FileShareProvider+NetworkErrorException: A logon error occurred when attempting to access the file share. The user account or password is not valid. > System.Runtime.InteropServices.COMException (0x8007052E): Logon failure: unknown user name or bad password. (Exception from HRESULT: 0x8007052E)
at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
at RSRemoteRpcClient.RemoteLogon.GetRemoteImpToken(String pRPCEndpointName, Int32 type, Guid dataSourceId, String pUserName, String pDomain, String pPassword)
at Microsoft.ReportingServices.FileShareDeliveryProvider.FileShareProvider.GetImpersonationToken(String userName, String domain, String userPwd)
End of inner exception stack trace
at Microsoft.ReportingServices.FileShareDeliveryProvider.FileShareProvider.GetImpersonationToken(String userName, String domain, String userPwd)
at Microsoft.ReportingServices.FileShareDeliveryProvider.FileShareProvider.SaveReport(Notification notification, SubscriptionData d)
ReportingServicesService!subscription!10!08/22/2007-16:17:08:: i INFO: Error writing file Test.pdf to path \\mrhowell\SYS\junk\josh

I have tried using the <domain>\<user> username syntax. I have tried sending to multiple different machines. The only deployment that succeeded was to \\localhost\c$\test with administrator credentials entered into the Subscription (unacceptable, of course).

I've seen this issue raised on this forum at least twice, and neither was met with any ideas or answers. Has anyone encountered and overcome this issue?
I'm having the exact same issue...if you get any sort of response please let me know.

|||Are you using the development edition? I think you can only use localhost on that.